Question
What is abnormal molar mass? Explain.
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Answer
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Match the graph given in Column I with the order of reaction given in Column II. More than one item in Column I may link to the same item of Column II.
Column I | Column II | ||
(i) |  | ||
(ii) |  | (a) | Ist order |
(iii) |  | (b) | Zero order |
(iv) |  |
- Complete the following chemical equations for reactions:
i. $\text{MnO}_{4(aq)}^{-}+\text{S}_{2}\text{O}_{3(aq)}^{2-}+\text{H}_{2}\text{O}_{(l)}\rightarrow$
ii. $\text{Cr}_{2}\text{O}^{-}_{7(aq)}+\text{H}_{2}\text{S}_{(g)}+\text{H}^{+}_{(aq)}\rightarrow$
- Give an explanation for each of the following, observations:
- The gradual decrease in size (actinoid contraction) from element to element is greater among the .actinoids than that among the lanthanoids (lanthanoid contraction).
- The greatest number of oxidation states are exhibited by the members in the middle of a transition series.
- With the same d-orbital configuration (d4) Cr2+ ion is a reducing agent but Mn3+ ion is an oxidising agent.
The decomposition of a hydrocarbon follows the equation.
→$\text{k}=(4.5\times10^{11}\text{s}^{-1})\text{e}^{-28000}\text{ K/T}$
Calculate Ea.
- The elements of 3d transition series are given as:
Sc Ti V Cr Mn Fe Co Ni Cu Zn
Answer the following:
- Which element has the highest m.p. and why?
- Which element is a strong oxidising agent in +3 oxidation state and why?
- Which element is soft and why?
- Write the equations involved in the preparation of Potassium dichromate from Sodium chromate (Na2CrO4).
The experimental data for decomposition of N2O5
[2N2O5 → 4NO2 + O2]
in gas phase at 318K are given below:
[2N2O5 → 4NO2 + O2]
in gas phase at 318K are given below:
| t/s | 0 | 400 | 800 | 1200 | 1600 | 2000 | 2400 | 2800 | 3200 |
| 102 × [N2O5]/mol L-1 | 1.63 | 1.36 | 1.14 | 0.93 | 0.78 | 0.64 | 0.53 | 0.43 | 0.35 |
- Plot [N2O5] against t.
- Find the half-life period for the reaction.
- Draw a graph between log[N2O5] and t.
- What is the rate law?
- Calculate the rate constant.
- Calculate the half-life period from k and compare it with (ii).
[NIC14]2- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why?
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table :
→| Experiment | $[ A ] / mol L ^{-1}$ | $[ B ] / mol L ^{-1}$ | Initial rate $/ mol$ $L ^{-1} min^{-1}$ |
| I | 0.1 | 0.1 | $2.0 \times 10^{-2}$ |
| II | - | 0.2 | $4.0 \times 10^{-2}$ |
| III | 0.4 | 0.4 | - |
| IV | - | 0.2 | $2.0 \times 10^{-2}$ |
Graphically explain the effect of temperature on the rate constant of reaction. How can this temperature effect on rate constant be represented quantitatively?
Derive formula for degree of dissociation and degree of condensation of the solute in the solvent.
Answer the following question:
What is the freezing point of 0.4 molal solution of acetic acid in benzene in which it dimerises to the extent of 85%? Freezing point of benzene is 278.4K and its molar heat of fusion is 10.042kJ mol-1.
What is the freezing point of 0.4 molal solution of acetic acid in benzene in which it dimerises to the extent of 85%? Freezing point of benzene is 278.4K and its molar heat of fusion is 10.042kJ mol-1.